DGN 图纸

作为 DWG 一部分的 DGN 格式图纸

Aspose.CAD for Java 允许开发人员导出包含嵌入 DGN 下图的 DWG 文件。以下是演示如何在导出 DWG 文件时访问 DWG 文件内的 DGN 下图的代码。

        
// Input and Output file paths
    String dataDir = Utils.getDataDir(ExportDGNAsPartofDWG.class) + "ExportingDGN/";
// Input and Output file paths
String fileName = dataDir + "BlockRefDgn.dwg";
String outPath = dataDir +"BlockRefDgn.dwg.pdf";

// Create an instance of PdfOptions class as we are exporting the DWG file to PDF format
com.aspose.cad.imageoptions.PdfOptions exportOptions = new com.aspose.cad.imageoptions.PdfOptions();

// Load any existing DWG file as image and convert it to CadImage type
com.aspose.cad.fileformats.cad.CadImage cadImage = (com.aspose.cad.fileformats.cad.CadImage) com.aspose.cad.Image.load(fileName);

// Go through each entity inside the DWG file
for (com.aspose.cad.fileformats.cad.cadobjects.CadBaseEntity baseEntity : cadImage.getEntities())
{
    // Check if entity is an image definition
    if (baseEntity.getTypeName() == com.aspose.cad.fileformats.cad.cadconsts.CadEntityTypeName.DGNUNDERLAY)
    {
        com.aspose.cad.fileformats.cad.cadobjects.CadDgnUnderlay dgnFile = (com.aspose.cad.fileformats.cad.cadobjects.CadDgnUnderlay)baseEntity;

        // Get external reference to object
        System.out.println(dgnFile.getUnderlayPath());
    }
}

// Define settings for CadRasterizationOptions object
com.aspose.cad.imageoptions.CadRasterizationOptions vectorRasterizationOptions = new com.aspose.cad.imageoptions.CadRasterizationOptions();
vectorRasterizationOptions.setPageWidth(1600);
vectorRasterizationOptions.setPageHeight(1600);
vectorRasterizationOptions.setLayouts(new String[] { "Model" });
vectorRasterizationOptions.setAutomaticLayoutsScaling(false);
vectorRasterizationOptions.setNoScaling(true);
      
vectorRasterizationOptions.setBackgroundColor(com.aspose.cad.Color.getBlack());
vectorRasterizationOptions.setDrawType(com.aspose.cad.fileformats.cad.CadDrawTypeMode.UseObjectColor);

// Set Vector Rasterization Options
exportOptions.setVectorRasterizationOptions(vectorRasterizationOptions);

// Export the DWG to PDF by calling Save method
cadImage.save(outPath, exportOptions);

DGN v7 的 3D 实体支持

Aspose.CAD for Java API 引入了加载 DGN AutoCAD 文件的功能，并支持 DGN v7 的 3D 实体。CadImage 类实现了这个目的。每个 DGN 图像支持 9 个预定义视图。它的枚举从 1 到 9。如果在导出时未定义视图，对于多页输出格式（如 PDF），所有视图将被导出，每个视图在一个单独的页面上。DGN 文件格式支持 3D 实体，以及 2D。对于 DGN 格式（同时支持 2D 和 3D），不再使用 VectorRasterizationOptions.TypeOfEntities。

查看支持的 DGN 元素的示例代码。

String fileName = dataDir + "Nikon_D90_Camera.dgn";
String outFile  = dataDir + "Nikon_D90_Camera.dgn";
            
DgnImage objImage = (DgnImage)com.aspose.cad.Image.load(fileName);
            
    PdfOptions options = new PdfOptions();
    CadRasterizationOptions vectorOptions = new CadRasterizationOptions();
    vectorOptions.setPageWidth(1500);
    vectorOptions.setPageHeight(1500);
    vectorOptions.setAutomaticLayoutsScaling(true);
    vectorOptions.setBackgroundColor(Color.getBlack());
    vectorOptions.setLayouts(new String[] { "1", "2", "3", "9" });//only export 4 (1,2,3 and 9) views
    options.setVectorRasterizationOptions(vectorOptions);

    objImage.save(outFile, options);
            

// Input and Output file paths
String fileName = "BlockRefDgn.dwg";
String outPath = "BlockRefDgn.dwg.pdf";
       
DgnImage dgnImage = (DgnImage)Image.load(dataDir);
{
    for (DgnDrawingElementBase element : dgnImage.getElements())
    {
        switch (element.getMetadata().getType())
        {
            case DgnElementType.Line:
            case DgnElementType.Ellipse:
            case DgnElementType.Curve:
            case DgnElementType.BSplineCurveHeader:
            case DgnElementType.Arc:
            case DgnElementType.Shape:
            case DgnElementType.PolyLine:
            case DgnElementType.TextNode:
            case DgnElementType.Text:
            case DgnElementType.ComplexShapeHeader:
            case DgnElementType.ComplexChainHeader:
            {
                //previously supported entities, now supported also for 3D
                break;
            }

            case DgnElementType.SolidHeader3D:
            case DgnElementType.Cone:
            case DgnElementType.CellHeader:
            {
                //supported 3D entities
                break;
            }
        }